Random Access Preamble Power Control for Wireless Latency Reduction
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information in wireless communication systems poses a challenge due to limited resources, requiring efficient methods for uplink/downlink data and control information transmission while reducing latency and supporting new radio access technologies.
Innovation Solution
The method involves determining the transmission power for a preamble in a wireless communication system based on a preamble transmission counter and downlink path loss estimate, allowing for efficient random access procedure performance by user equipment (UE) using multiple random access channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipment and data transmission is increased to satisfy rapidly increasing data throughput demands, then data capacity and communication service quality are improved, but the limited radio resources become insufficient and system latency increases
Solution Approach 1:
The patent segments the random access procedure into multiple independent preamble transmission attempts with different power levels. Each preamble transmission is treated as a separate event with its own power calculation based on path loss estimates, allowing the system to handle multiple UEs simultaneously without resource conflicts while reducing latency through parallel access opportunities.
Solution Approach 2:
The patent performs preliminary path loss estimation before actual data transmission. By calculating the downlink path loss estimate in advance and using it to determine the optimal preamble transmission power, the system prepares the transmission parameters beforehand, avoiding delays during the actual transmission phase and reducing overall system latency.
2Adaptability or versatility
If multiple random access channel resources are allocated to handle increased UE density, then the number of simultaneous access attempts is improved, but the complexity of resource management and power determination increases
Solution Approach 1:
The patent changes the power determination parameter from fixed or blindly guessed values to dynamic calculations based on measured downlink path loss estimates. This parameter change simplifies the device complexity by providing a clear, measurable basis for power selection while enabling adaptable resource allocation across multiple random access channels. Each UE independently determines its transmit power using the formula: preamble transmission power = base power + path loss estimate, eliminating the need for complex centralized power management.
Data Source
AI summary
According to the present invention, transmission power of a preamble for a random access process is determined on the basis of a preamble transmission counter and a downlink path loss estimate value in a wireless communication system. The preamble transmission counter is calculated by using the number of preamble transmissions performed by a user equipment for the random access process, regardless of a random access channel resource. The downlink path loss estimate value is calculated for a synchronization signal linked to the random access channel resource used in transmitting a corresponding preamble. Other downlink path loss estimate values can be calculated for other synchronization signals.